Oil & Gas
| Sat 06 Jun 2026
Beijing, June 6 -- State Intellectual Property Office of China has received PetroChina patent application for Multifunctional Pressure Control Valve. Liu Shiying, Tong Hongwen, Yang Xinyu, Chen Sixuan, Huo Xiao, Li Hongxin, Yang Wei, Zhu Mingzhe, Zhang Jingzhi, Zheng Xiuhai, Song Linfeng, Zhang Chuang, Yu Guoying and Wang Zhigan..